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Difficulty: HardGastrointestinal and Abdominal Surgery

A 38-year-old woman is brought to the emergency department by emergency medical services due to the abrupt onset of excruciating abdominal pain. The pain began 4 hours ago and has progressively worsened, accompanied by multiple episodes of bilious emesis. Her medical history is notable for severe obesity, for which she underwent a laparoscopic Roux-en-Y gastric bypass two years ago, resulting in a 45-kg (99-lb) weight loss. Vital signs show a temperature of 38.5°C (101.3°F), a pulse of 126/min, a respiratory rate of 22/min, and a blood pressure of 84/52 mm Hg. On physical examination, she appears toxic and lies completely still on the stretcher. The abdomen is distinctly distended and tympanitic; palpation elicits diffuse rigidity, marked rebound tenderness, and involuntary guarding. Bowel sounds are absent. A peripheral intravenous line is placed, and isotonic crystalloid resuscitation is rapidly initiated. Which of the following is the most appropriate next step in the care of this patient?

  1. Emergent exploratory laparotomyAnswer
  2. B
    Computed tomography of the abdomen and pelvis with intravenous contrast
  3. C
    Insertion of a nasogastric tube for gastrointestinal decompression and serial examinations
  4. D
    Upright abdominal and chest radiography
  5. E
    Admission to the intensive care unit for administration of broad-spectrum antibiotics and vasopressors

Answer

The correct answer is emergent exploratory laparotomy.
This patient presents with a classic acute surgical abdomen characterized by hemodynamic instability (hypotension, tachycardia) and overt peritonitis (rigidity, diffuse rebound tenderness). Given her history of a Roux-en-Y gastric bypass, she is at high risk for an internal hernia (e.g., through Petersen's space), which can lead to a closed-loop small bowel obstruction. A closed-loop obstruction rapidly progresses to bowel ischemia, strangulation, and necrosis, leading to septic shock. In any patient presenting with an acute abdomen with signs of peritonitis and hemodynamic instability, the definitive and life-saving next step is immediate surgical exploration (laparotomy) to resect ischemic bowel and achieve source control. Further diagnostic testing or conservative management is strictly contraindicated as it delays definitive treatment.

Step-by-Step Solution

1
Analyze the patient's surgical history and current symptoms.
The patient had a Roux-en-Y gastric bypass and now presents with acute, severe abdominal pain and bilious emesis.
This specific surgical history places the patient at high risk for an internal hernia (e.g., through Petersen's space), which often causes a rapidly progressing closed-loop small bowel obstruction.
2
Evaluate the patient's hemodynamic status and physical examination findings.
The patient is in septic shock (blood pressure 84/52 mm Hg, tachycardia, fever) and demonstrates overt peritonitis (rigid abdomen, marked rebound tenderness, involuntary guarding).
Identifying hemodynamic instability and a rigid abdomen is critical for distinguishing between a patient who can be observed and one who requires immediate life-saving intervention.
3
Determine the standard of care for a hemodynamically unstable patient with an acute surgical abdomen.
The definitive treatment is immediate surgical exploration to resect ischemic or necrotic bowel and achieve source control.
When peritonitis and shock are present, bowel strangulation and infarction have likely occurred. Delaying surgery for imaging or attempting conservative management drastically increases mortality.

Key Concept

Patients with a history of Roux-en-Y gastric bypass are at high risk for internal hernias leading to closed-loop small bowel obstructions. When these patients present with hemodynamic instability and peritonitis, emergent exploratory laparotomy is the mandatory next step.
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Topics

Gastrointestinal and Abdominal Surgery

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